Hydrogen jump motion in Laves-phase hydrides: Two frequency scales

Two types of hydrogen jump motion with different characteristic jump rates have been found to coexist in a number of Laves-phase hydrides. While the slower jump process is responsible for the long-range diffusion, the faster process corresponds to localized hydrogen motion over small groups of inter...

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Bibliographic Details
Published in:Journal of alloys and compounds 2005-12, Vol.404, p.224-229
Main Author: Skripov, A.V.
Format: Article
Language:English
Subjects:
Hydrogen storage materials
Intermetallics
Neutron scattering
Nuclear resonances
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Summary:Two types of hydrogen jump motion with different characteristic jump rates have been found to coexist in a number of Laves-phase hydrides. While the slower jump process is responsible for the long-range diffusion, the faster process corresponds to localized hydrogen motion over small groups of interstitial sites. In some of the Laves-phase compounds, the localized hydrogen motion is not ‘frozen out’ on the frequency scale of 10 7 to 10 8 s −1 down to 20 K. This paper reviews recent progress in investigations of the microscopic picture and systematics of H jump motion in Laves-phase hydrides. The relation between the hydrogen jump rates and the structure of hydrogen sublattice is emphasized.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2004.12.160